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Align the NuttX open(2) flag constants with the Linux asm-generic values so that the FUSE wire protocol and other cross-platform interfaces work without conversion. All code that used '(flags & O_RDONLY)' as a bitmask check (always 0 now that O_RDONLY=0) has been updated to use '(flags & O_ACCMODE)' comparisons. The NUTTX_O_* constants in include/nuttx/fs/hostfs.h are updated to match, and the sim hostfs open flag mapping is fixed. Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>