cleanup: Refactor #ifdefs toenable use of IS_ENABLE
cleanup: Refactor #ifdefs toenable use of IS_ENABLE

This change fixes #ifdef gaurds around CONFIG_USB_PD_TCPC_LOW_POWER
and CONFIG_USB_PE_SM by replacing it with IS_ENABLED condition

BUG=b:141971044
BRANCH=None
TEST=make buildall -j

Change-Id: I889752a8c4cdd8e22c97ede99643945fe2db868a
Signed-off-by: Ayushee <5730d7ed61dc96fa04bcc2bc2e4ce32af5b2c19d@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1863823
Reviewed-by: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>

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