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/kernel-config.nix

@@ -0,0 +1,29 @@
+# Shared kernel configuration for i.MX platforms
+# This configuration is used across i.MX93, i.MX8MP, i.MX8MQ and similar platforms
+{
+  # Common kernel extra configuration for i.MX platforms
+  # Includes: virtualization support, EFI boot, RAID, USB/IP, framebuffer settings
+  imxCommonKernelConfig = ''
+    CRYPTO_TLS m
+    TLS y
+    MD_RAID0 m
+    MD_RAID1 m
+    MD_RAID10 m
+    MD_RAID456 m
+    DM_VERITY m
+    LOGO y
+    FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER n
+    FB_EFI n
+    EFI_STUB y
+    EFI y
+    VIRTIO y
+    VIRTIO_PCI y
+    VIRTIO_BLK y
+    DRM_VIRTIO_GPU y
+    EXT4_FS y
+    USBIP_CORE m
+    USBIP_VHCI_HCD m
+    USBIP_HOST m
+    USBIP_VUDC m
+  '';
+}