x86/tsc: Move inline keyword to the beginning of function declarations

The inline keyword was not at the beginning of the function declarations.
Fix the following warnings triggered when using W=1:

  arch/x86/kernel/tsc.c:62:1: warning: 'inline' is not at beginning of declaration [-Wold-style-declaration]
  arch/x86/kernel/tsc.c:79:1: warning: 'inline' is not at beginning of declaration [-Wold-style-declaration]

Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: trivial@kernel.org
Cc: kernel-janitors@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lkml.kernel.org/r/20190524103252.28575-1-malat@debian.org