msm_serial_hs: Complete resource disable sequence before enable

The resource requests which originate from the clients
need to be managed so that disable sequence completes
before begining the enable sequence.

CRs-Fixed: 680236
Change-Id: Ib29d862a798b967070c0c2b81c4a0dff3415a463
Signed-off-by: Naveen Kaje <nkaje@codeaurora.org>