zephyr: Drop duplicate IS_BIT_SET()
This gives a warning about a duplicate definition since it is defined
in Zephyr now.
BRANCH=none
TEST=warning is gone
#define NPCX_FWCTRL_FW_SLOT 1
#define SET_BIT(reg, bit) ((reg) |= (0x1 << (bit)))
#define CLEAR_BIT(reg, bit) ((reg) &= (~(0x1 << (bit))))
+
+/* TODO(b:179900857) Clean this up too */
+#undef IS_BIT_SET
#define IS_BIT_SET(reg, bit) (((reg) >> (bit)) & (0x1))
void system_jump_to_booter(void)
