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_zcu102_defconfig b/configs/xilinx_zynqmp_zcu102_defconfig
index 46a5dd0..b370bc1 100644
--- a/configs/xilinx_zynqmp_zcu102_defconfig
+++ b/configs/xilinx_zynqmp_zcu102_defconfig
@@ -56,3 +56,4 @@
 CONFIG_G_DNL_MANUFACTURER="Xilinx"
 CONFIG_G_DNL_VENDOR_NUM=0x03FD
 CONFIG_G_DNL_PRODUCT_NUM=0x0300
+CONFIG_EFI_LOADER_BOUNCE_BUFFER=y