x86: vdso/vma.c declare vdso_enabled and arch_setup_additional_pages before they get used
x86: vdso/vma.c declare vdso_enabled and arch_setup_additional_pages before they get used

Impact: cleanup, address sparse warnings

Addresses the problem pointed out by these sparse warning:
  arch/x86/vdso/vma.c:19:28: warning: symbol 'vdso_enabled' was not declared. Should it be static?
  arch/x86/vdso/vma.c:101:5: warning: symbol 'arch_setup_additional_pages' was not declared. Should it be static?

Signed-off-by: Jaswinder Singh Rajput <0599c1aba1ea3f0bcaf4115dd8076db98ee6d35c@gmail.com>
LKML-Reference: <2e9060f3de6df2695926c3286402f9b7317bba45@localhost.localdomain>
Signed-off-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@elte.hu>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas