Fix the following -Werror warning from clang 10.0.0:

sys/arm/arm/identcpu-v6.c:227:5: error: misleading indentation; statement is not part of the previous 'if' [-Werror,-Wmisleading-indentation]

if (val & CPUV7_CT_CTYPE_RA)
^

sys/arm/arm/identcpu-v6.c:225:4: note: previous statement is here

if (val & CPUV7_CT_CTYPE_WB)
^

This was due to an accidentally inserted tab before the if statement.

MFC after: 3 days