Log Message:
Update intel-microcode-netbsd to 20190918.

== 20190918 Release ==
-- Updates upon 20190618 release --
Processor             Identifier     Version       Products
Model        Stepping F-MO-S/PI      Old->New
---- new platforms ----------------------------------------

---- updated platforms ------------------------------------
BDW-U/Y      E0/F0    6-3d-4/c0 0000002d->0000002e Core Gen5
HSX-EX       E0       6-3f-4/80 00000014->00000016 Xeon E7 v3
BDW-H/E3     E0/G0    6-47-1/22 00000020->00000021 Core Gen5
BDX-ML       B0/M0/R0 6-4f-1/ef 0b000036->0b000038 Xeon E5/E7 v4; Core \ 
i7-69xx/68xx
BDX-DE       V1       6-56-2/10 0000001a->0000001c Xeon D-1520/40
BDX-DE       V2/3     6-56-3/10 07000017->07000019 Xeon \ 
D-1518/19/21/27/28/31/33/37/41/48, Pentium D1507/08/09/17/19
BDX-DE       Y0       6-56-4/10 0f000015->0f000017 Xeon D-1557/59/67/71/77/81/87
BDX-NS       A0       6-56-5/10 0e00000d->0e00000f Xeon D-1513N/23/33/43/53
SKX-SP       H0/M0/U0 6-55-4/b7 0200005e->00000064 Xeon Scalable
SKX-D        M1       6-55-4/b7 0200005e->00000064 Xeon D-21xx
CLX-SP       B1       6-55-7/bf 05000021->0500002b Xeon Scalable Gen2