Revert "feat(uart): add uart7 support"

huangcm

2025-07-01 676035278781360996553c427a12bf358249ebf7

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#include "defs.h"
#include "xlat/umount_flags.h"
 
SYS_FUNC(umount2)
{
    printpath(tcp, tcp->u_arg[0]);
    tprints(", ");
    printflags(umount_flags, tcp->u_arg[1], "MNT_???");
 
    return RVAL_DECODED;
}