ata: remove redundant 'default n' from Kconfig

'default n' is the default value for any bool or tristate Kconfig
setting so there is no need to write it explicitly.

Also since commit f467c564 ("kconfig: only write '# CONFIG_FOO
is not set' for visible symbols") the Kconfig behavior is the same
regardless of 'default n' being present or not:

    ...
    One side effect of (and the main motivation for) this change is making
    the following two definitions behave exactly the same:

        config FOO
                bool

        config FOO
                bool
                default n

    With this change, neither of these will generate a
    '# CONFIG_FOO is not set' line (assuming FOO isn't selected/implied).
    That might make it clearer to people that a bare 'default n' is
    redundant.
    ...
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/ata/Kconfig

@@ -33,7 +33,6 @@ if ATA
 
 config ATA_NONSTANDARD
        bool
-       default n
 
 config ATA_VERBOSE_ERROR
 	bool "Verbose ATA error reporting"
@@ -62,7 +61,6 @@ config ATA_ACPI
 config SATA_ZPODD
 	bool "SATA Zero Power Optical Disc Drive (ZPODD) support"
 	depends on ATA_ACPI && PM
-	default n
 	help
 	  This option adds support for SATA Zero Power Optical Disc
 	  Drive (ZPODD). It requires both the ODD and the platform