kselftests: dmabuf-heaps: Fix Makefile's inclusion of the kernel's usr/include dir

Copied in from somewhere else, the makefile was including
the kerne's usr/include dir, which caused the asm/ioctl.h file
to be used.

Unfortunately, that file has different values for _IOC_SIZEBITS
and _IOC_WRITE than include/uapi/asm-generic/ioctl.h which then
causes the _IOCW macros to give the wrong ioctl numbers,
specifically for DMA_BUF_IOCTL_SYNC.

This patch simply removes the extra include from the Makefile

Cc: Shuah Khan <[email protected]>
Cc: Brian Starkey <[email protected]>
Cc: Sumit Semwal <[email protected]>
Cc: Laura Abbott <[email protected]>
Cc: Hridya Valsaraju <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Sandeep Patil <[email protected]>
Cc: Daniel Mentz <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Fixes: a877992 ("kselftests: Add dma-heap test")
Signed-off-by: John Stultz <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

Author: johnstultz-work

tools/testing/selftests/dmabuf-heaps/Makefile

@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-CFLAGS += -static -O3 -Wl,-no-as-needed -Wall -I../../../../usr/include
+CFLAGS += -static -O3 -Wl,-no-as-needed -Wall
 
 TEST_GEN_PROGS = dmabuf-heap