x86/svm: Fold nsvm_{wr,rd}msr() into svm_msr_{read,write}_intercept()

x86/svm: Fold nsvm_{wr,rd}msr() into svm_msr_{read,write}_intercept()

... to simplify the default cases.

There are multiple errors with the handling of these three MSRs, but they are
deliberately not addressed at this point.

This removes the dance converting -1/0/1 into X86EMUL_*, allowing for the
removal of the 'ret' variable.

While cleaning this up, drop the gdprintk()'s for #GP conditions, and the
'result' variable from svm_msr_write_intercept() as it is never modified.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>