drivers/i2c/pca9538/Makefile.inc: Remove unused path

Change-Id: I435837381a966b61081d023447a6e7fdfd9a9348
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71553
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
diff --git a/src/drivers/i2c/pca9538/Makefile.inc b/src/drivers/i2c/pca9538/Makefile.inc
index 8b7fa25..51e9764 100644
--- a/src/drivers/i2c/pca9538/Makefile.inc
+++ b/src/drivers/i2c/pca9538/Makefile.inc
@@ -1,5 +1 @@
 ramstage-$(CONFIG_DRIVERS_I2C_PCA9538) += pca9538.c
-
-ifeq ($(CONFIG_DRIVERS_I2C_PCA9538),y)
-CFLAGS_common += -Isrc/drivers/i2c/pca9538
-endif