asm-generic: Fix spelling of architecture

Fix spelling of "architecture" in the Kbuild file.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

include/asm-generic/Kbuild

@@ -2,7 +2,7 @@
 #
 # asm headers that all architectures except um should have
 # (This file is not included when SRCARCH=um since UML borrows several
-# asm headers from the host architecutre.)
+# asm headers from the host architecture.)
 
 mandatory-y += atomic.h
 mandatory-y += archrandom.h