raspberrypi*.conf: Remove vc4 configuration as we already default to it

As of late[1], we defaulted to enabling vc4graphics in MACHINE_FEATURES.
Let's cleanup the machine configurations as per this change.

[1] https://github.com/agherzan/meta-raspberrypi/pull/417

Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>

conf/machine/raspberrypi3-64.conf

@@ -23,7 +23,6 @@ RPI_KERNEL_DEVICETREE = " \
 SERIAL_CONSOLES ?= "115200;ttyS0"
 
 UBOOT_MACHINE = "rpi_3_config"
-MACHINE_FEATURES_append = " vc4graphics"
 
 # When u-boot is enabled we need to use the "Image" format and the "booti"
 # command to load the kernel

conf/machine/raspberrypi4-64.conf

@@ -20,7 +20,6 @@ SDIMG_KERNELIMAGE ?= "kernel8.img"
 SERIAL_CONSOLES ?= "115200;ttyS0"
 
 UBOOT_MACHINE = "rpi_4_config"
-MACHINE_FEATURES_append = " vc4graphics"
 
 VC4DTBO ?= "vc4-fkms-v3d"
 

conf/machine/raspberrypi4.conf

@@ -16,6 +16,5 @@ SDIMG_KERNELIMAGE ?= "kernel7l.img"
 UBOOT_MACHINE = "rpi_4_32b_config"
 SERIAL_CONSOLES ?= "115200;ttyS0"
 
-MACHINE_FEATURES_append = " vc4graphics"
 VC4DTBO ?= "vc4-fkms-v3d"
 ARMSTUB ?= "armstub7.bin"