spd/lp5: Modify Hynix LPDDR5X memory Speed

spd/lp5: Modify Hynix LPDDR5X memory Speed

Because SPD tool now supports 8533Mbps, so modify speed to regenerate
the SPD file for Hynix H58G66BK8BX067 and H58G56BK8BX068.

BUG=b:263189532, b:270629852
TEST=util/spd_tools/bin/spd_gen spd/lp5/memory_parts.json lp5

Change-Id: I813fc1495836dbe33de426cf41a1f58c8e8a046e
Signed-off-by: John Su <john_su@compal.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73251
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Dtrain Hsu <dtrain_hsu@compal.corp-partner.google.com>
Reviewed-by: Ian Feng <ian_feng@compal.corp-partner.google.com>
Reviewed-by: Chao Gui <chaogui@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>