sky2: Stop printing VPD info to debugfs

sky2: Stop printing VPD info to debugfs

Sky2 is parsing the VPD and adds the parsed information to its debugfs
file. This isn't needed in kernel, userspace tools like lspci can be
used to display such information nicely. Therefore remove this from
the driver.

lspci -vv:

Capabilities: [50] Vital Product Data
	Product Name: Marvell Yukon 88E8070 Gigabit Ethernet Controller
	Read-only fields:
		[PN] Part number: Yukon 88E8070
		[EC] Engineering changes: Rev. 1.0
		[MN] Manufacture ID: Marvell
		[SN] Serial number: AbCdEfG970FD4
		[CP] Extended capability: 01 10 cc 03
		[RV] Reserved: checksum good, 9 byte(s) reserved
	Read/write fields:
		[RW] Read-write area: 1 byte(s) free
	End

Relevant part in debugfs file:

0000:01:00.0 Product Data
Marvell Yukon 88E8070 Gigabit Ethernet Controller
 Part Number: Yukon 88E8070
 Engineering Level: Rev. 1.0
 Manufacturer: Marvell
 Serial Number: AbCdEfG970FD4

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Link: https://lore.kernel.org/r/bbaee8ab-9b2e-de04-ee7b-571e094cc5fe@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>