zephyr: charger: support zephyr compilation
zephyr: charger: support zephyr compilation

This change requires to avoid redefination of macro
CONFIG_CHARGER_BQ25710_PKPWR_TOVLD_DEG for zephyr.

BUG=none
BRANCH=none
TEST=make buildall

Signed-off-by: Rajesh Kumar <ef973afabdaa06670be7215ef6ba2acd6d71d568@intel.com>
Change-Id: I6c77047913bfc3c2b2aa1b29ac973934dd7b00da
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3403307
Reviewed-by: Wai-Hong Tam <04b587fdf5845741a0c5a8b9cd59ca72d73ef8fc@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec