arm64/mm: Add FEAT_LPA2 specific fallback (48 bits PA) when not implemented

CONFIG_ARM64_PA_BITS_52 build kernels need to fallback for 48 bits PA range
encodings when FEAT_LPA2 is not implemented i.e TCR_EL1.DS could not be set
.  Hence modify applicable PTE and TTBR encoding helpers to accommodate the
scenario via 'arm64_lpa2_enabled'.

Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>