kernel: add missing config symbols

The addition of kmod-input-touchscreen-ads7846 enabled
INPUT_TOUCHSCREEN, which exposes several other symbols on various
targets. Add those symbols to the generic kernel configs to fix build.

Fixes: 77a54bbf13 ("kernel: add kmod-input-touchscreen-ads7846")
Reported-by: Hannu Nyman <hannu.nyman@iki.fi>
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

target/linux/generic/config-4.14

@@ -5001,15 +5001,18 @@ CONFIG_TMPFS_XATTR=y
 # CONFIG_TOUCHSCREEN_GOODIX is not set
 # CONFIG_TOUCHSCREEN_GUNZE is not set
 # CONFIG_TOUCHSCREEN_HAMPSHIRE is not set
+# CONFIG_TOUCHSCREEN_HTCPEN is not set
 # CONFIG_TOUCHSCREEN_ILI210X is not set
 # CONFIG_TOUCHSCREEN_IMX6UL_TSC is not set
 # CONFIG_TOUCHSCREEN_INEXIO is not set
+# CONFIG_TOUCHSCREEN_IPROC is not set
 # CONFIG_TOUCHSCREEN_MAX11801 is not set
 # CONFIG_TOUCHSCREEN_MCS5000 is not set
 # CONFIG_TOUCHSCREEN_MELFAS_MIP4 is not set
 # CONFIG_TOUCHSCREEN_MK712 is not set
 # CONFIG_TOUCHSCREEN_MMS114 is not set
 # CONFIG_TOUCHSCREEN_MTOUCH is not set
+# CONFIG_TOUCHSCREEN_MXS_LRADC is not set
 # CONFIG_TOUCHSCREEN_PENMOUNT is not set
 # CONFIG_TOUCHSCREEN_PIXCIR is not set
 # CONFIG_TOUCHSCREEN_RM_TS is not set
@@ -5023,6 +5026,7 @@ CONFIG_TMPFS_XATTR=y
 # CONFIG_TOUCHSCREEN_SURFACE3_SPI is not set
 # CONFIG_TOUCHSCREEN_SX8654 is not set
 # CONFIG_TOUCHSCREEN_SYNAPTICS_I2C_RMI4 is not set
+# CONFIG_TOUCHSCREEN_TI_AM335X_TSC is not set
 # CONFIG_TOUCHSCREEN_TOUCHIT213 is not set
 # CONFIG_TOUCHSCREEN_TOUCHRIGHT is not set
 # CONFIG_TOUCHSCREEN_TOUCHWIN is not set