plat: xilinx: versal: Remove code duplication
plat: xilinx: versal: Remove code duplication

Some switch cases uses same operation. So, club switch cases
which uses same operation and remove duplicate code.

Signed-off-by: Rajan Vaja <958387e48e282671f29716c1b482329c5293cdb8@xilinx.com>
Change-Id: I260b474c0ff3f2ca102c32d4af2e4abba2b8f57c

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