backlight: qcom-spmi-wled: restrict HFRC clocks WA to PM8150L alone

Apply existing workaround of forcing HFRC clocks off before WLED module
disable for PM8150L alone, as the issue is fixed in HW from PM7325B.

Change-Id: I8a7bc231f1711ce964c96ec28088546981e81fae
Signed-off-by: Jishnu Prakash <jprakash@codeaurora.org>