rename kernel_intern.h

german "intern" to english "internal"
fixed old-style-declaration warning

board_init.c:7:1: warning: 'static' is not at beginning of declaration
[-Wold-style-declaration]
Merge pull request #14 from mehlis/rename_kernel_intern

rename kernel_intern.h
Merge pull request #13 from mehlis/fix_old_style_warning

fixed old-style-declaration warning