KVM: PPC: Kconfig: Fix indentation

The convention for indentation seems to be a single tab. Help text is
further indented by an additional two whitespaces. Fix the lines that
violate these rules.
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220520115431.147593-1-juergh@canonical.com

arch/powerpc/kvm/Kconfig

@@ -166,7 +166,7 @@ config KVM_BOOK3S_HV_NESTED_PMU_WORKAROUND
 	  Old nested HV capable Linux guests have a bug where they don't
 	  reflect the PMU in-use status of their L2 guest to the L0 host
 	  while the L2 PMU registers are live. This can result in loss
-          of L2 PMU register state, causing perf to not work correctly in
+	  of L2 PMU register state, causing perf to not work correctly in
 	  L2 guests.
 
 	  Selecting this option for the L0 host implements a workaround for