refactor(nxp): parameterize i.MX platform builders to reduce duplication

This refactoring reduces code duplication across i.MX93, i.MX8MP, and
i.MX8MQ platforms by extracting common build logic into parameterized
shared builders. This makes it easier to maintain and add new i.MX
platforms while ensuring consistency across all platforms.

nxp/common/lib/uboot-config.nix

@@ -0,0 +1,33 @@
+# Shared U-Boot configuration for i.MX platforms
+# This configuration is used across i.MX93, i.MX8MP, i.MX8MQ and similar platforms
+{
+  # Generate common U-Boot extra configuration for i.MX platforms
+  # ramdiskAddr and fdtAddr are platform-specific memory addresses
+  imxCommonUbootConfig =
+    { ramdiskAddr, fdtAddr }:
+    ''
+      CONFIG_USE_BOOTCOMMAND=y
+      CONFIG_BOOTCOMMAND="setenv ramdisk_addr_r ${ramdiskAddr}; setenv fdt_addr_r ${fdtAddr}; run distro_bootcmd; "
+      CONFIG_CMD_BOOTEFI_SELFTEST=y
+      CONFIG_CMD_BOOTEFI=y
+      CONFIG_EFI_LOADER=y
+      CONFIG_BLK=y
+      CONFIG_PARTITIONS=y
+      CONFIG_DM_DEVICE_REMOVE=n
+      CONFIG_CMD_CACHE=y
+    '';
+
+  # Common U-Boot native build inputs for i.MX platforms
+  imxCommonUbootNativeBuildInputs = [
+    "bison"
+    "flex"
+    "openssl"
+    "which"
+    "ncurses"
+    "libuuid"
+    "gnutls"
+    "openssl"
+    "perl"
+    "efitools"
+  ];
+}