input: sensor: increase MMA8x5x idle polling interval

Increase idle state polling interval for MMA8x5x to reduce power
consumption caused by idle polling.

CRs-Fixed: 542388
Change-Id: Id1e2c319e1310abfdf7d9ecd416c94c63d0e1768
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>