t/nvmept_trim: increase transfer size for some tests #821

Job	Run time
build (linux-gcc)	10m 12s
build (linux-clang)	9m 36s
build (macos)	7m 17s
build (linux-i686-gcc)	8m 40s
build (android)	39s
build (windows-cygwin-64)	11m 55s
build (windows-cygwin-32)	11m 52s
build (windows-msys2-64)	10m 40s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	41s
	1h 11m 32s

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