KVM: SVM: Add helpers for accessing MSR bitmap that don't rely on offsets

Add macro-built helpers for testing, setting, and clearing MSRPM entries
without relying on precomputed offsets.  This sets the stage for eventually
removing general KVM use of precomputed offsets, which are quite confusing
and rather inefficient for the vast majority of KVM's usage.

Outside of merging L0 and L1 bitmaps for nested SVM, using u32-indexed
offsets and accesses is at best unnecessary, and at worst introduces extra
operations to retrieve the individual bit from within the offset u32 value.
And simply calling them "offsets" is very confusing, as the "unit" of the
offset isn't immediately obvious.

Use the new helpers in set_msr_interception_bitmap() and
msr_write_intercepted() to verify the math and operations, but keep the
existing offset-based logic in set_msr_interception_bitmap() to sanity
check the "clear" and "set" operations.  Manipulating MSR interceptions
isn't a hot path and no kernel release is ever expected to contain this
specific version of set_msr_interception_bitmap() (it will be removed
entirely in the near future).

Link: https://lore.kernel.org/r/20250610225737.156318-14-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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