qpnp-haptic: Fix writing incorrect value to EN_CTL1 when disabling haptics

Currently, variable "val" is used for caching the last value
written to EN_CTL1 register and also it is used to read STATUS
register. This causes an incorrect value being written to
EN_CTL1 register when the module is disabled. Fix it.

CRs-Fixed: 2032850
Change-Id: Ib3cbe1b41962e5dff38d9c4d343d8f3f43fc0009
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>