bcm27xx-gpu-fw: fix package

Install definition was accidentally removed in 7afdbc0 and IB fails.

Fixes: 7afdbc0 ("bcm27xx-gpu-fw: update to latest version")
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

package/kernel/bcm27xx-gpu-fw/Makefile

@@ -4,7 +4,7 @@ include $(INCLUDE_DIR)/kernel.mk
 PKG_NAME:=bcm27xx-gpu-fw
 PKG_VERSION:=2024.10.08
 PKG_VERSION_REAL:=1.$(subst .,,$(PKG_VERSION))
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=raspi-firmware_$(PKG_VERSION_REAL).orig.tar.xz
 PKG_SOURCE_URL:=https://github.com/raspberrypi/firmware/releases/download/$(PKG_VERSION_REAL)
@@ -33,6 +33,10 @@ define Build/Compile
 	true
 endef
 
+define Package/bcm27xx-gpu-fw/install
+	true
+endef
+
 define Build/InstallDev
 	$(CP) $(PKG_BUILD_DIR)/boot/bootcode.bin $(KERNEL_BUILD_DIR)
 	$(CP) $(PKG_BUILD_DIR)/boot/LICENCE.broadcom $(KERNEL_BUILD_DIR)