power: qpnp-bms: fix unbalanced IRQs in qpnp-bms.c

In qpnp-bms.c there is a bug where IRQs are getting used
before being registered. Hence, bms_request_irqs() needs
to be moved before battery_insertion_check().

CRs-fixed: 596174
Change-Id: I74c2aa9e14495c22b3cdaa1a3d1f712f9b3cabf6
Signed-off-by: Xu Kai <kaixu@codeaurora.org>