ARM: vfp: Fix vfp_pm_suspend/resume to use vfp_flush_context/vfp_reinit

In 393e4bfaaf79377d29cd6bb2228f87601aeca668 commit, as part of
refactoring common code, vfp_pm_suspend was renamed to
vfp_flush_context to allow use by other clients besides suspend/resume.
vfp_reinit was introduced to take on vfp_pm_resume's role. In addition
vfp_pm_suspend and vfp_pm_resume were modified to use these apis but
this change got dropped susbsequently. Change vfp_pm_suspend and
vfp_pm_resume to use these apis.

CRs-Fixed: 269828
Change-Id: I4c967310d93c47a0e363166abdd609da2099fb05
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>