arm64: Use the UL macro in TCR_EL1 defines

While clang can handle numbers with a UL suffix in assembly files
gcc/gas is unable to. Switch to use the UL macro for TCR_EL1 defines as
some are used in locore.S

Reviewed by: brooks, jhb
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D45261