starqltechn: use button keyboard driver

Button keyboard driver used to navigate bootmenu entries.

Add gpio buttons, button keyboard driver.
Add gpio keys dts bindings.

Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/starqltechn_defconfig b/configs/starqltechn_defconfig
index 599d926..92e7254 100644
--- a/configs/starqltechn_defconfig
+++ b/configs/starqltechn_defconfig
@@ -20,9 +20,12 @@
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_BMP=y
 # CONFIG_NET is not set
+CONFIG_BUTTON=y
 CONFIG_CLK=y
 CONFIG_MSM_GPIO=y
 CONFIG_QCOM_PMIC_GPIO=y
+CONFIG_DM_KEYBOARD=y
+CONFIG_BUTTON_KEYBOARD=y
 CONFIG_PINCTRL=y
 CONFIG_DM_PMIC=y
 CONFIG_PMIC_QCOM=y