arch-x86: De-indent arch/x86/regs/misc.hh.
arch-x86: De-indent arch/x86/regs/misc.hh.

Namespaces are not supposed to increase indentation.

Change-Id: I6736c5049ea8d853dc67f319192b9eaa97d27cb1
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/49757
Maintainer: Gabe Black <d3e8afea784ab4a50a2dbf9149d2eaa8478e1cbc@gmail.com>
Reviewed-by: Gabe Black <d3e8afea784ab4a50a2dbf9149d2eaa8478e1cbc@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5