board/zynqmp/kria/kv260/uboot.fragment: move to board/zynqmp/kria

This patch moves the board/zynqmp/kria/kv260/uboot.fragment file
to the board/zynqmp/kria directory.  The reason is that this file
is the same for any kria starter kit and is not specific to the kv260.
By moving the file, it can be logically re-used with the kr260 when
support for this starter kit is added to buildroot.

KR260 Starter Kit:
https://www.xilinx.com/products/som/kria/kr260-robotics-starter-kit.html

Signed-off-by: Neal Frager <neal.frager@amd.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/zynqmp_kria_kv260_defconfig

@@ -24,7 +24,7 @@ BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
 BR2_TARGET_UBOOT_CUSTOM_TARBALL=y
 BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION="$(call github,Xilinx,u-boot-xlnx,xlnx_rebase_v2022.01_2022.2)/xlnx_rebase_v2022.01_2022.2.tar.gz"
 BR2_TARGET_UBOOT_BOARD_DEFCONFIG="xilinx_zynqmp_virt"
-BR2_TARGET_UBOOT_CONFIG_FRAGMENT_FILES="board/zynqmp/kria/kv260/uboot.fragment"
+BR2_TARGET_UBOOT_CONFIG_FRAGMENT_FILES="board/zynqmp/kria/uboot.fragment"
 BR2_TARGET_UBOOT_CUSTOM_MAKEOPTS="DEVICE_TREE=zynqmp-smk-k26-revA"
 BR2_TARGET_UBOOT_NEEDS_DTC=y
 BR2_TARGET_UBOOT_NEEDS_OPENSSL=y