package/freescale-imx/Config.in: introduce i.MX91 silicon revision

This commit introduces the silicon revision number configuration.
This value will be used by packages for specific configurations
(such as security firmware).

Signed-off-by: Juan Pablo MONTERO CASTRO <juanpablo.monterocastro@nxp.com>
[Julien: split original commit 1/3]
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/freescale-imx/Config.in

@@ -93,6 +93,21 @@ config BR2_PACKAGE_FREESCALE_IMX_PLATFORM_IMX8ULPA2
 
 endchoice
 
+choice
+	prompt "i.MX 91 Silicon Revision"
+	default BR2_PACKAGE_FREESCALE_IMX_PLATFORM_IMX91A0
+	depends on BR2_PACKAGE_FREESCALE_IMX_PLATFORM_IMX91
+	help
+	  Some packages related to the selected i.MX platform need to
+	  know the silicon revision of the platform they will run on.
+
+	  Note - mismatches may result in a failure to boot!
+
+config BR2_PACKAGE_FREESCALE_IMX_PLATFORM_IMX91A0
+	bool "imx91a0"
+
+endchoice
+
 choice
 	prompt "i.MX 93 Silicon Revision"
 	default BR2_PACKAGE_FREESCALE_IMX_PLATFORM_IMX93A1