powerpc/kvm: Remove unused macros from asm-offset

The kvm code was refactored to convert some of kvm assembly routines to C.
This includes commits which moved code path for the kvm guest entry/exit
for p7/8 from aseembly to C. As part of the code changes, usage of some of
the macros were removed. But definitions still exist in the assembly files.
Commits are listed below:

Commit 2e1ae9cd ("KVM: PPC: Book3S HV: Implement radix prefetch workaround by disabling MMU")
Commit 9769a7fd ("KVM: PPC: Book3S HV: Remove radix guest support from P7/8 path")
Commit fae5c9f3 ("KVM: PPC: Book3S HV: remove ISA v3.0 and v3.1 support from P7/8 path")
Commit 57dc0eed ("KVM: PPC: Book3S HV P9: Implement PMU save/restore in C")

Many of the asm-offset macro definitions were missed to remove. Patch
fixes by removing the unused macros.

Signed-off-by: Disha Goel <disgoel@linux.vnet.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220916105736.268153-2-disgoel@linux.vnet.ibm.com