power: qpnp-fg: fix fg-soc interrupt naming

Fix the SW_FALLBK_NEW_BATT interrupt under FG_SOC to have the
same naming convention as other interrupts. While at it, remove
the unwanted "fg-soc-irq-count" from the "interrupt-names" under
fg-soc device.

Change-Id: Ib801a4adbbb43cd894b690f2af463e70e39dd4d5
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>