GC ATA_REQUEST_TIMEOUT option remnants

It was removed from code in r249083 and from sys/conf/options in r249213.

PR:		222170
MFC after:	3 days

sys/conf/NOTES

@@ -1759,14 +1759,6 @@ hint.ata.1.at="isa"
 hint.ata.1.port="0x170"
 hint.ata.1.irq="15"
 
-#
-# The following options are valid on the ATA driver:
-#
-# ATA_REQUEST_TIMEOUT:	the number of seconds to wait for an ATA request
-#			before timing out.
-
-#options 	ATA_REQUEST_TIMEOUT=10
-
 #
 # Standard floppy disk controllers and floppy tapes, supports
 # the Y-E DATA External FDD (PC Card)

sys/dev/ata/ata-all.h

@@ -203,10 +203,6 @@
 #define ATA_OP_FINISHED                 1
 #define ATA_MAX_28BIT_LBA               268435455UL
 
-#ifndef	ATA_REQUEST_TIMEOUT
-#define	ATA_REQUEST_TIMEOUT		10
-#endif
-
 /* structure used for composite atomic operations */
 #define MAX_COMPOSITES          32              /* u_int32_t bits */
 struct ata_composite {