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>