imx: Add iMX91 support

iMX91 is reduced part from iMX93 with part number: i.MX9131/11/01
It removed A55_1, M33, MIPI DSI, LVDS, etc.

i.MX9131:
  - Support 2.4GT/s DDR and HWFFC at 1.2GT/s
i.MX9121:
  - A55 at 800Mhz and DDR at 1600MTS, with low drive mode.
i.MX9111:
  - Support 1.6GT/s DDR and HWFFC at 800MT/s
i.MX9101:
  - Support 800Mhz ARM clock
  - Support 1.6GT/s DDR and HWFFC at 800MT/s
  - No parallel display, eQOS, flexcan

Updated Clock/Container/CPU and etc for i.MX91

Signed-off-by: Ye Li <ye.li@nxp.com>
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 2465e31..4554e21 100644
--- a/arch/arm/mach-imx/imx9/Kconfig
+++ b/arch/arm/mach-imx/imx9/Kconfig
@@ -16,6 +16,12 @@
 	select IMX9
 	select ARMV8_SPL_EXCEPTION_VECTORS
 
+config IMX91
+	bool
+	select IMX9
+	select ARMV8_SPL_EXCEPTION_VECTORS
+
+
 config SYS_SOC
 	default "imx9"