feat(smccc): add bit definition for SMCCC_ARCH_SOC_ID
feat(smccc): add bit definition for SMCCC_ARCH_SOC_ID

The definitions of SMCCC_ARCH_SOC_ID SoC version return bits are defined
in SMC Calling Convention [1]. Add the masks and shifts for JEP-106 bank
index, JEP-106 identification code, and Implementation defined SoC ID.
Add a macro to easily set JEP-106 fields.

 [1] https://developer.arm.com/documentation/den0028/latest/

Signed-off-by: Yann Gautier <e753f6969c288905606e3c07464886d4f1fc1be0@foss.st.com>
Change-Id: Iecbd09f6de6728de89dc746d2d1981a5a97a8ab7

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware