kconfig: Remove symbol types from Kconfig.defconfig files

Same deal as in commit 7fdb525754 ("kconfig: Use 'default' instead of
'def_bool' in Kconfig.defconfig files"), but I hacked Kconfiglib to also
find cases where the type is given separately as e.g.

    config FOO
            int
            default 3

Motivation (from a note in
https://docs.zephyrproject.org/latest/guides/kconfig/index.html):

    For a symbol defined in multiple locations (e.g., in a
    Kconfig.defconfig file in Zephyr), it is best to only give the
    symbol type for the "base" definition of the symbol, and to use
    'default' (instead of 'def_<type>' value) for the remaining
    definitions. That way, if the base definition of the symbol is
    removed, the symbol ends up without a type, which generates a
    warning that points to the other definitions. That makes the extra
    definitions easier to discover and remove.

It's also nice if 'def_bool' and the like turn into a semi-reliable flag
that the symbol is only defined in Kconfig.defconfig files. That might
be a sign that things could be cleaned up.

Will do a separate pass later to remove some symbols only defined in
Kconfig.defconfig files.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>

soc/arm/st_stm32/stm32l4/Kconfig.defconfig.stm32l432xx

@@ -9,7 +9,6 @@
 if SOC_STM32L432XX
 
 config SOC
-	string
 	default "stm32l432xx"
 
 config NUM_IRQS

soc/arm/st_stm32/stm32l4/Kconfig.defconfig.stm32l433xx

@@ -8,7 +8,6 @@
 if SOC_STM32L433XX
 
 config SOC
-	string
 	default "stm32l433xx"
 
 config NUM_IRQS

soc/arm/st_stm32/stm32l4/Kconfig.defconfig.stm32l452xx

@@ -8,7 +8,6 @@
 if SOC_STM32L452XX
 
 config SOC
-	string
 	default "stm32l452xx"
 
 config NUM_IRQS

soc/arm/st_stm32/stm32l4/Kconfig.defconfig.stm32l471xx

@@ -8,7 +8,6 @@
 if SOC_STM32L471XX
 
 config SOC
-	string
 	default "stm32l471xx"
 
 config NUM_IRQS

soc/arm/st_stm32/stm32l4/Kconfig.defconfig.stm32l475xx

@@ -8,7 +8,6 @@
 if SOC_STM32L475XX
 
 config SOC
-	string
 	default "stm32l475xx"
 
 config NUM_IRQS

soc/arm/st_stm32/stm32l4/Kconfig.defconfig.stm32l476xx

@@ -9,7 +9,6 @@
 if SOC_STM32L476XX
 
 config SOC
-	string
 	default "stm32l476xx"
 
 config NUM_IRQS

soc/arm/st_stm32/stm32l4/Kconfig.defconfig.stm32l496xx

@@ -10,7 +10,6 @@
 if SOC_STM32L496XX
 
 config SOC
-	string
 	default "stm32l496xx"
 
 config NUM_IRQS

soc/arm/st_stm32/stm32l4/Kconfig.defconfig.stm32l4r5xx

@@ -8,7 +8,6 @@
 if SOC_STM32L4R5XX
 
 config SOC
-	string
 	default "stm32l4r5xx"
 
 config NUM_IRQS

soc/arm/st_stm32/stm32l4/Kconfig.defconfig.stm32l4r9xx

@@ -8,7 +8,6 @@
 if SOC_STM32L4R9XX
 
 config SOC
-	string
 	default "stm32l4r9xx"
 
 config NUM_IRQS