[dv/jtag] Fix regression failure

Fix issue #17373 due to change in PR #17253.
I think the preferred the method to select jtag tap is to use
`cfg.select_jtag` flag.

Signed-off-by: Cindy Chen <chencindy@opentitan.org>

hw/top_earlgrey/dv/env/seq_lib/chip_jtag_csr_rw_vseq.sv

diff --git a/hw/top_earlgrey/dv/env/seq_lib/chip_jtag_csr_rw_vseq.sv b/hw/top_earlgrey/dv/env/seq_lib/chip_jtag_csr_rw_vseq.sv
index 2456779..4b2bbfe 100644
--- a/hw/top_earlgrey/dv/env/seq_lib/chip_jtag_csr_rw_vseq.sv
+++ b/hw/top_earlgrey/dv/env/seq_lib/chip_jtag_csr_rw_vseq.sv
@@ -9,7 +9,7 @@
   `uvm_object_new
 
   virtual task pre_start();
-    cfg.chip_vif.tap_straps_if.drive(JtagTapRvDm);
+    cfg.select_jtag = JtagTapRvDm;
     cfg.m_jtag_riscv_agent_cfg.is_rv_dm = 1;
     super.pre_start();
   endtask

hw/top_earlgrey/dv/env/seq_lib/chip_jtag_mem_vseq.sv

diff --git a/hw/top_earlgrey/dv/env/seq_lib/chip_jtag_mem_vseq.sv b/hw/top_earlgrey/dv/env/seq_lib/chip_jtag_mem_vseq.sv
index 5bbcae8..df22e0b 100644
--- a/hw/top_earlgrey/dv/env/seq_lib/chip_jtag_mem_vseq.sv
+++ b/hw/top_earlgrey/dv/env/seq_lib/chip_jtag_mem_vseq.sv
@@ -13,7 +13,7 @@
   `uvm_object_new
 
   virtual task pre_start();
-    cfg.chip_vif.tap_straps_if.drive(JtagTapRvDm);
+    cfg.select_jtag = JtagTapRvDm;
     cfg.m_jtag_riscv_agent_cfg.is_rv_dm = 1;
     super.pre_start();
   endtask