soc: arm: add infineon_xmc series support

Add infineon xmc series with XMC4500 support. XMC series comes with,
- CPU operates upto 120MHz
- 3 RAM (PSRAM1 - code, DSRAM1 - data and DSRAM2 - communiation)
- upto 1MB flash

init: clock control & gpio is not done, so SoC initialization directly
relies on HAL. Core operating clock is stored in no_init section, which
is kept under DSRAM1. Only DSRAM1 is used until clock support. Using
PSRAM1 and DSRAM1 needs adaptation in linker script - planned for next
revision.

Note: SystemInit cannot be consumed directly due to vector table +
HAL linker dependency.

Signed-off-by: Parthiban Nallathambi <parthiban@linumiz.com>

modules/Kconfig.infineon

@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright (c) 2020 Linumiz
+# Author: Parthiban Nallathambi <parthiban@linumiz.com>
+
+config HAS_XMCLIB
+	bool
+	select HAS_CMSIS_CORE
+	depends on SOC_FAMILY_XMC
+
+if HAS_XMCLIB
+
+config HAS_XMCLIB_UART
+	bool
+	help
+	  Enable XMCLIB Universal asynchronous receiver transmitter (UART)
+
+endif # HAS_XMCLIB