[U-Boot] Regression due to "efi_loader: efi_allocate_pages is too restrictive"

[Stephen Warren]

Commit aa909462d018 "efi_loader: efi_allocate_pages is too restrictive" 
causes a failure (synchronous abort) in the command "dhcp zImage" on 
board p2371-2180 (Jetson TX1). Reverting this commit alone solves the 
problem. According to the exception dump, elr/pc is in 
efi_allocate_pages(), which makes sense given the content of the patch. 
Do you have any ideas? Thanks.

Failure log:

U-Boot 2018.07-00378-gaa909462d018 (Jul 31 2018 - 13:06:57 -0600)

TEGRA210
Model: NVIDIA P2371-2180
Board: NVIDIA P2371-2180
DRAM:  3.5 GiB
MMC:   sdhci at 700b0000: 1, sdhci at 700b0600: 0
Loading Environment from MMC... *** Warning - bad CRC, using default 
environment

Failed (-5)
In:    serial
Out:   serial
Err:   serial
Net:   No ethernet found.
Hit any key to stop autoboot:  0
Tegra210 (P2371-2180) # pci enum
Tegra210 (P2371-2180) # dhcp zImage

Warning: eth_rtl8169 using MAC address from ROM
BOOTP broadcast 1
DHCP client bound to address 10.20.204.52 (2 ms)
Using eth_rtl8169 device
TFTP from server 10.20.204.51; our IP address is 10.20.204.52
Filename 'zImage'.
Load address: 0x80080000
Loading: "Synchronous Abort" handler, esr 0x96000044
elr: 000000008015a8b0 lr : 000000008015a8a8 (reloc)
elr: 00000000dff6f8b0 lr : 00000000dff6f8a8
x0 : 0000000000000000 x1 : 000000017ffff000
x2 : 00000000dda2dc20 x3 : 0000000080000000
x4 : 0000000000000000 x5 : 0000000000000000
x6 : 0000000000000015 x7 : 00000000dda1cf58
x8 : 00000000dda36030 x9 : 0000000000000008
x10: 0000000000000000 x11: 00000000dda1c774
x12: 0000000000000000 x13: 00000000dda1c768
x14: 0000000000000004 x15: 00000000ffffffff
x16: 0000000000002080 x17: 0000000000010000
x18: 00000000dda22dd0 x19: 0000000000000001
x20: 00000000dda1d048 x21: 00000000dff8dcae
x22: 00000000dff97823 x23: 00000000dff9c000
x24: 00000000dffed000 x25: 00000000dffed5b4
x26: 0000000000000000 x27: 00000000dffef000
x28: 00000000dffef000 x29: 00000000dda1cff0

Resetting CPU ...