site/arm-linux: Fix typo for sizeof_char_p

I noticed a typo while looking at the file. It doesn't change a value but
worth fixing since I spotted it.

(From OE-Core rev: 84b407ca5542a6fa828c4b0c62ff60964db73901)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/site/arm-linux

@@ -3,7 +3,7 @@ ac_cv_sizeof___int64=${ac_cv_sizeof___int64=0}
 ac_cv_sizeof_char=${ac_cv_sizeof_char=1}
 ac_cv_sizeof_wchar_t=${ac_cv_sizeof_wchar_t=1}
 ac_cv_sizeof_unsigned_char=${ac_cv_sizeof_unsigned_char=1}
-ac_cv_sizeof_char_p=${ac_cv_sizeof_int_p=4}
+ac_cv_sizeof_char_p=${ac_cv_sizeof_char_p=4}
 ac_cv_sizeof_int=${ac_cv_sizeof_int=4}
 ac_cv_sizeof_int_p=${ac_cv_sizeof_int_p=4}
 ac_cv_sizeof_long=${ac_cv_sizeof_long=4}