util/nvmutil: don't usleep on file reads

i don't care. it's only 30 tries.

usleep can fail, setting errno, and it can actually
take longer, depending on the environment. it poisons
errno, and makes debugging harder.

just remove it.

Signed-off-by: Leah Rowe <leah@libreboot.org>

util/nvmutil/nvmutil.c

@@ -448,9 +448,6 @@ check_read_or_die(const char *rpath, ssize_t rval, size_t rsize,
 		err(EINTR, "%s: max retries exceeded on file: %s",
 		    readtype, rpath);
 
-	/* Prevent CPU hog when on spin-locked reads. */
-	usleep(1);
-
 	/*
 	 * Bad read, with errno EINTR (syscall interrupted).
 	 * Reset the error state and try again.