e1000e: Replace convert_art_to_tsc()

The core code now provides a mechanism to convert the ART base clock to the
corresponding TSC value without requiring an architecture specific
function.

Replace the direct conversion by filling in the required data.

No functional change intended.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240513103813.5666-4-lakshmi.sowjanya.d@intel.com

drivers/net/ethernet/intel/e1000e/ptp.c

@@ -124,7 +124,8 @@ static int e1000e_phc_get_syncdevicetime(ktime_t *device,
 	sys_cycles = er32(PLTSTMPH);
 	sys_cycles <<= 32;
 	sys_cycles |= er32(PLTSTMPL);
-	*system = convert_art_to_tsc(sys_cycles);
+	system->cycles = sys_cycles;
+	system->cs_id = CSID_X86_ART;
 
 	return 0;
 }