ANDROID: arm64: add __va_function and __pa_function

We use non-canonical CFI jump tables with CONFIG_CFI_CLANG, which
means the compiler replaces function address references with the
address of the function's CFI jump table entry. This results in
__pa_symbol(function), for example, returning the physical address
of the jump table entry, which can lead to address space confusion
since the jump table itself points to a virtual address. The same
issue happens when passing function pointers to hypervisor code
running at EL2.

This change adds __va_function and __pa_function macros, which use
inline assembly to take the actual function address instead, and
changes the relevant code to use these macros.

Bug: 145210207
Change-Id: Ie3079c10427bde705a2244cfb3cb5fb954e5e065
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>