RFR: 8213719: Both sect163r2 and sect163k1 are default curves for field size 163

[Weijun Wang]

There should only be one curve having type BD or PD in CurveDB.java for any given length. Here we keep the last one (sect163r2) so there's no behavior change.

I tried to search on the net to see if there is a consensus on which curve is meant to be the default one for a size, but cannot find one for 163. If anyone can find it I'll be happy to take a look.

Noreg-cleanup.

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Commit messages:
 - 8213719: Both sect163r2 and sect163k1 are default curves for field size 163

Changes: https://git.openjdk.java.net/jdk/pull/1485/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1485&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8213719
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1485.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1485/head:pull/1485

PR: https://git.openjdk.java.net/jdk/pull/1485