imx: Support i.MX93 9X9 QSB board

Add i.MX93 9x9 Quick Start Board support.
 - Two ddr scripts included w/o inline ecc feature.
 - SDHC/NETWORK/I2C/UART supported
 - PCA9450 supported, default over drive mode
 - Documentation added.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/imx9/Kconfig b/arch/arm/mach-imx/imx9/Kconfig
index 4d32c28..5c10541 100644
--- a/arch/arm/mach-imx/imx9/Kconfig
+++ b/arch/arm/mach-imx/imx9/Kconfig
@@ -23,6 +23,13 @@
 	prompt  "NXP i.MX9 board select"
 	optional
 
+config TARGET_IMX93_9X9_QSB
+	bool "imx93_qsb"
+	select OF_BOARD_FIXUP
+	select IMX93
+	select IMX9_LPDDR4X
+	imply OF_UPSTREAM
+
 config TARGET_IMX93_11X11_EVK
 	bool "imx93_11x11_evk"
 	select OF_BOARD_FIXUP
@@ -42,6 +49,7 @@
 endchoice
 
 source "board/freescale/imx93_evk/Kconfig"
+source "board/freescale/imx93_qsb/Kconfig"
 source "board/phytec/phycore_imx93/Kconfig"
 source "board/variscite/imx93_var_som/Kconfig"