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/ls2080ardb_SECURE_BOOT_defconfig b/configs/ls2080ardb_SECURE_BOOT_defconfig
index 41d30a6..f974d88 100644
--- a/configs/ls2080ardb_SECURE_BOOT_defconfig
+++ b/configs/ls2080ardb_SECURE_BOOT_defconfig
@@ -30,3 +30,4 @@
 CONFIG_SYS_NS16550=y
 CONFIG_FSL_DSPI=y
 CONFIG_RSA=y
+CONFIG_EFI_LOADER_BOUNCE_BUFFER=y