sys: Enable pcfclock.ko on all architectures

This driver has been in sys/conf/NOTES (and thus enabled in LINT
builds on all architectures) since the file was renamed from the i386
LINT and there is no i386-specific code in the driver.

Reviewed by:	imp, markj
Differential Revision:	https://reviews.freebsd.org/D60177

sys/modules/Makefile

@@ -319,7 +319,7 @@ SUBDIR=	\
 	${_padlock} \
 	${_padlock_rng} \
 	${_pchtherm} \
-	${_pcfclock} \
+	pcfclock \
 	${_pf} \
 	${_pflog} \
 	${_pflow} \
@@ -924,7 +924,6 @@ _3dfx=		3dfx
 _3dfx_linux=	3dfx_linux
 _glxiic=	glxiic
 _glxsb=		glxsb
-_pcfclock=	pcfclock
 _pst=		pst
 _sbni=		sbni
 .endif