arch: arm: replace PLATFORM_SPECIFIC_INIT with PLATFORM_RESET_HOOK

Use generic hook infrastrucutre instead of custom Kconfig and hooks for
ARM.

Replace z_arm_platform_init() with platform_reset().

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

soc/nuvoton/numaker/Kconfig

@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 config SOC_FAMILY_NUMAKER
-	select PLATFORM_SPECIFIC_INIT
+	select SOC_RESET_HOOK
 
 if SOC_FAMILY_NUMAKER
 

soc/nuvoton/numaker/m2l31x/soc.c

@@ -9,7 +9,7 @@
 /* Hardware and starter kit includes. */
 #include <NuMicro.h>
 
-void z_arm_platform_init(void)
+void soc_reset_hook(void)
 {
 	SystemInit();
 

soc/nuvoton/numaker/m46x/soc.c

@@ -9,7 +9,7 @@
 /* Hardware and starter kit includes. */
 #include <NuMicro.h>
 
-void z_arm_platform_init(void)
+void soc_reset_hook(void)
 {
 	SystemInit();
 

soc/nuvoton/numicro/Kconfig

@@ -4,7 +4,7 @@
 # Author: Saravanan Sekar <saravanan@linumiz.com>
 
 config SOC_FAMILY_NUMICRO
-	select PLATFORM_SPECIFIC_INIT
+	select SOC_RESET_HOOK
 
 if SOC_FAMILY_NUMICRO
 

soc/nuvoton/numicro/m48x/soc.c

@@ -8,7 +8,7 @@
 #include <zephyr/init.h>
 #include <zephyr/kernel.h>
 
-void z_arm_platform_init(void)
+void soc_reset_hook(void)
 {
 	SYS_UnlockReg();