[S] Change in coreboot[main]: libpayload: Add dma_allocator_range()

[Yi Chou (Code Review)]

Attention is currently required from: Julius Werner, Yi Chou, Yu-Ping Wu.

Hello Julius Werner, Yu-Ping Wu, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/78407?usp=email

to look at the new patch set (#3).

Change subject: libpayload: Add dma_allocator_range()
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libpayload: Add dma_allocator_range()

Some sensitive data may remain on the DMA buffer, we will want to zero
out everything on the DMA buffer before we jump into the kernel.

To accomplish that, we will need this function to get the range of memory
that can be allocated by the dma allocator.

BUG=b:248610274
TEST=emerge-cherry libpayload
BRANCH=none

Signed-off-by: Yi Chou 
Change-Id: I8f3058dfd861ed44f716623967201b8cabe8d166
---
M payloads/libpayload/include/stdlib.h
M payloads/libpayload/libc/malloc.c
2 files changed, 13 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/07/78407/3