platform/x86: pmc_atom: remove unused pmc_atom_write()

This function isn't used anywhere in the driver or anywhere in tree.
So remove it.  It can always be re-added if/when a use arises.

Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Aubrey Li <aubrey.li@linux.intel.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Mark Gross <markgross@kernel.org>
Cc: platform-driver-x86@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Link: https://lore.kernel.org/r/20220428062430.31010-2-paul.gortmaker@windriver.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/pmc_atom.c

@@ -223,18 +223,6 @@ int pmc_atom_read(int offset, u32 *value)
 }
 EXPORT_SYMBOL_GPL(pmc_atom_read);
 
-int pmc_atom_write(int offset, u32 value)
-{
-	struct pmc_dev *pmc = &pmc_device;
-
-	if (!pmc->init)
-		return -ENODEV;
-
-	pmc_reg_write(pmc, offset, value);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(pmc_atom_write);
-
 static void pmc_power_off(void)
 {
 	u16	pm1_cnt_port;

include/linux/platform_data/x86/pmc_atom.h

@@ -144,6 +144,5 @@
 #define	SLEEP_ENABLE		0x2000
 
 extern int pmc_atom_read(int offset, u32 *value);
-extern int pmc_atom_write(int offset, u32 value);
 
 #endif /* PMC_ATOM_H */