[ARM] arm32ve: arm64: For 32bit guest CPSR.E bit decides VCPU endianness

For arm32 guest, the SCTLR.EE bit tells exception endianness and
CPSR.E bit tells current CPU endianness.

For arm64 guest, the SCTLR_EL1.EE bit tell exception endianness and
CPU endianness both.

This patch updates data endiannes detection for arm32ve and arm64
as per above.

Signed-off-by: Anup Patel <anup@brainfault.org>