platform/x86: pmc_atom: Fix comment typo

The double `of' is duplicated in line 50, remove one.
Signed-off-by: Xin Gao <gaoxin@cdjrlc.com>
Link: https://lore.kernel.org/r/20220722022337.15903-1-gaoxin@cdjrlc.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>

include/linux/platform_data/x86/pmc_atom.h

@@ -47,7 +47,7 @@
 #define	PMC_S0I2_TMR		0x88
 #define	PMC_S0I3_TMR		0x8C
 #define	PMC_S0_TMR		0x90
-/* Sleep state counter is in units of of 32us */
+/* Sleep state counter is in units of 32us */
 #define	PMC_TMR_SHIFT		5
 
 /* Power status of power islands */