efi_loader: Select bounce buffers for known-bad boards

We know for certain that we have 32bit DMA hardware, but 64bit addresses
on LS2085A and ZynqMP, so let's enable EFI bounce buffers for all defconfigs
on these SoCs.

Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/configs/xilinx_zynqmp_zc1751_xm016_dc2_defconfig b/configs/xilinx_zynqmp_zc1751_xm016_dc2_defconfig
index 2811d4b..77e6180 100644
--- a/configs/xilinx_zynqmp_zc1751_xm016_dc2_defconfig
+++ b/configs/xilinx_zynqmp_zc1751_xm016_dc2_defconfig
@@ -50,3 +50,4 @@
 CONFIG_G_DNL_MANUFACTURER="Xilinx"
 CONFIG_G_DNL_VENDOR_NUM=0x03FD
 CONFIG_G_DNL_PRODUCT_NUM=0x0300
+CONFIG_EFI_LOADER_BOUNCE_BUFFER=y