Fix ARM relocation trucation build errors

[dylan-eustice]

When building unit tests on an AGX Orin Devkit, the following error was observed:

[100%] Linking CXX executable matx_test
CMakeFiles/matx_test.dir/main.cu.o: in function `main':
/home/deustice/MatX/test/main.cu:40:(.text+0xa4): relocation truncated to fit: R_AARCH64_CALL26 against symbol `testing::InitGoogleTest(int*, char**)' defined in .text section in ../lib/libgtest.a(gtest-all.cc.o)
CMakeFiles/matx_test.dir/main.cu.o: in function `__sti____cudaRegisterAll()':
/tmp/tmpxft_001053bc_00000000-6_main.cudafe1.stub.c:13:(.text+0x1b4): relocation truncated to fit: R_AARCH64_CALL26 against symbol `atexit' defined in .text section in /usr/lib/aarch64-linux-gnu/libc_nonshared.a(atexit.oS)
CMakeFiles/matx_test.dir/main.cu.o: in function `RUN_ALL_TESTS()':
/home/deustice/MatX/build/_deps/gtest-src/googletest/include/gtest/gtest.h:2334:(.text._Z13RUN_ALL_TESTSv[_Z13RUN_ALL_TESTSv]+0x8): relocation truncated to fit: R_AARCH64_CALL26 against symbol `testing::UnitTest::GetInstance()' defined in .text section in ../lib/libgtest.a(gtest-all.cc.o)
/home/deustice/MatX/build/_deps/gtest-src/googletest/include/gtest/gtest.h:2334:(.text._Z13RUN_ALL_TESTSv[_Z13RUN_ALL_TESTSv]+0xc): relocation truncated to fit: R_AARCH64_CALL26 against symbol `testing::UnitTest::Run()' defined in .text section in ../lib/libgtest.a(gtest-all.cc.o)
collect2: error: ld returned 1 exit status
make[2]: *** [test/CMakeFiles/matx_test.dir/build.make:1726: test/matx_test] Error 1
make[1]: *** [CMakeFiles/Makefile2:1119: test/CMakeFiles/matx_test.dir/all] Error 2
make: *** [Makefile:136: all] Error 2

This fixes the relocation errors by enabling position independent code instead of the default 26-bit offsets. Since there is a small performance trade-off by doing this, we might want to think about a less heavy-handed fix. It's unknown if this is actually needed for all ARM architectures or just Jetsons.

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[cliffburdick]

/build

[cliffburdick]

/build