src: Remove unused 'include <symbols.h>'

Change-Id: Ica355292eeda9c386b49db97f021566d52943d40
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41673
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/security/vboot/common.c

@@ -4,7 +4,6 @@
 #include <cbmem.h>
 #include <console/console.h>
 #include <fmap.h>
-#include <symbols.h>
 #include <vb2_api.h>
 #include <security/vboot/misc.h>
 #include <security/vboot/symbols.h>

src/soc/mediatek/mt8173/i2c.c

@@ -4,7 +4,6 @@
 #include <console/console.h>
 #include <delay.h>
 #include <device/i2c_simple.h>
-#include <symbols.h>
 #include <device/mmio.h>
 #include <soc/addressmap.h>
 #include <soc/i2c.h>

src/soc/nvidia/tegra124/spi.c

@@ -13,7 +13,6 @@
 #include <soc/spi.h>
 #include <spi-generic.h>
 #include <spi_flash.h>
-#include <symbols.h>
 #include <timer.h>
 #include <types.h>
 

src/soc/nvidia/tegra210/arm_tf.c

@@ -5,7 +5,6 @@
 #include <bl31.h>
 #include <soc/addressmap.h>
 #include <soc/console_uart.h>
-#include <symbols.h>
 #include <types.h>
 
 typedef struct bl31_plat_params {