drivers: input: sensors: fix latency issue with smi130 irq handler

CPU is taking 2ms+ time to come out of deep state of lpm mode to
serve the irq. Due to latency of SMI130 IRQ handler, there is drift
b/w the timestamp of data samples. To avoid this changed cpu state
to idle state with timer till IRQ ger served.

Change-Id: Ic00a2c23d3a9c2ff4c3da6dbfd29bce4305af6ce
Signed-off-by: Puneet Yatnal <puneet@codeaurora.org>