arm/dt: apq8074: drop chg prefix for qcom,chg devices

Drop the unnecessary chg prefix for SMBB and SMBBP charger peripherals.
Note that the qcom,chg-misc peripheral will not drop this
prefix to avoid confusion with the MISC device which
already uses qcom,misc as a device name.

Change-Id: Id4f0427364b95c46925e07c73ef8a9bdb13efd2c
Signed-off-by: Eugene Yasman <eyasman@codeaurora.org>